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AN-SY7152 の電気的特性と機能

AN-SY7152のメーカーはSilergyです、この部品の機能は「High Efficiency 1MHz 2A Step Up Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 AN-SY7152
部品説明 High Efficiency 1MHz 2A Step Up Regulator
メーカ Silergy
ロゴ Silergy ロゴ 




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AN-SY7152 Datasheet, AN-SY7152 PDF,ピン配置, 機能
Applications Note: AN_ SY7152
High Efficiency 1MHz, 2A Step Up Regulator
Preliminary Specification
General Description
The SY7152 is a high efficiency boost regulator
targeted for general step-up applications.
Ordering Information
SY7152 (□□)
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type Note
SY7152ABC
SOT23-6
2A
Features
Wide input range: 3-8V bias input, 16Vout max
1MHz switching frequency
Minimum on time: 100ns typical
Minimum off time: 100ns typical
Low RDS(ON): 150m
RoHS Compliant and Halogen Free
Accurate Reference: 0.6VREF
Compact package: SOT23-6
Applications
WLED Drivers
Networking cards powered from PCI or PCI-
express slots
Typical Applications
Figure 1. Schematic Diagram
Figure 2. Efficiency vs Load Current
AN_SY7152 Rev.0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 1

1 Page





AN-SY7152 pdf, ピン配列
Electrical Characteristics
(VIN = 5V, VOUT=12V, IOUT=100mA, TA = 25°C unless otherwise specified)
Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Low Side Main FET
RON
Main FET Current
Limit
Switching Frequency
Feedback Reference
Voltage
IN UVLO Rising
Threshold
UVLO Hysteresis
Thermal Shutdown
Temperature
EN Rising Threshold
EN Falling Threshold
EN Pin Input Current
Max Duty Cycle
Symbol
VIN
IQ
ISHDN
Rds(on)
ILIM1
Fsw
VREF
VIN,UVLO
UVLO,HYS
TSD
VENH
VENL
IEN
Test Conditions
VFB=0.66V
EN=0
AN_SY7152
Min Typ Max Unit
3 8V
100 µA
15 µA
150 m
2A
0.8 1 1.2 MHz
0.588 0.6 0.612 V
1.8 V
0.1 V
150 °C
1.5 V
0.4 V
0 100 nA
90 %
Note 1: Stresses listed beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These
are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
remain possibility to affect device reliability.
Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity
test board of JEDEC 51-3 thermal measurement standard. Test condition: Device mounted on 2” x 2” FR-4 substrate
PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane.
Note 3: The device is not guaranteed to function outside its operating conditions.
Note 4: IC could be start up in 1.8V.
AN_SY7152 Rev.0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 3


3Pages


AN-SY7152 電子部品, 半導体
AN_SY7152
Applications Information
Because of the high integration in the SY7152 IC, the
application circuit based on this regulator IC is rather
simple. Only input capacitor CIN, output capacitor COUT,
inductor L and feedback resistors (R1 and R2) need to
be selected for the targeted applications specifications.
Feedback resistor dividers R1 and R2:
Choose R1 and R2 to program the proper output voltage.
To minimize the power consumption under light loads,
it is desirable to choose large resistance values for both
R1 and R2. A value of between 10k and 1M is
recommended for both resistors. If R1=200k is chosen,
then R2 can be calculated to be:
R2 = (R1× 0.6V)/(VOUT 0.6V)
0.6VFB
VOUT
R1
GND
R2
Input capacitor CIN:
The ripple current through input capacitor is calculated
as:
ICIN_RMS = VIN (VOUT VIN)
2 3 L FSW VOUT
To minimize the potential noise problem, place a
typical X5R or better grade ceramic capacitor really
close to the IN and GND pins. Care should be taken to
minimize the loop area formed by CIN, and IN/GND
pins.In this case a 10uF low ESR ceramic is
recommended.
Output capacitor COUT:
The output capacitor is selected to handle the output
ripple noise requirements. Both steady state ripple and
transient requirements must be taken into consideration
when selecting this capacitor. For the best performance,
it is recommended to use X5R or better grade ceramic
capacitor with 25V rating and more than two pcs 10uF
capacitor.
Boost inductor L:
There are several considerations in choosing this
inductor.
1) Choose the inductance to provide the desired
ripple current. It is suggested to choose the ripple
current to be about 40% of the maximum average
input current. The inductance is calculated as:
L =  VIN 2
(VOUT VIN)
VOUT FSW × IOUT, MAX × 40%
where FSW is the switching frequency and IOUT,MAX is
the maximum load current.
The SY7152 regulator IC is quite tolerant of different
ripple current amplitude. Consequently, the final choice
of inductance can be slightly off the calculation value
without significantly impacting the performance.
2) The saturation current rating of the inductor must
be selected to be greater than the peak inductor
current under full load conditions.
ISAT,MIN
>

VOUT
VIN

×
IOUT_MAX
+
VIN(VOUT VIN)
2 × FSW × L × VOUT
3) The DCR of the inductor and the core loss at the
switching frequency must be low enough to
achieve the desired efficiency requirement. It is
desirable to choose an inductor with
DCR<50mohm to achieve a good overall
efficiency.
Enable Operation
Pulling the EN pin low (<0.4V) will shut down the
device. During the shut down mode, the SY7152 shut
down current drops to lower than 1uA, Driving the EN
pin high (>1.5V) will turn on the IC again.
Soft-start(En Control)
The SY7152 has a built-in soft-start to control the rise
rate of the output voltage and limit the input current
surge during IC start-up. 200us turn on delay time
before the initial soft-start, the typical soft-start time is
1ms.
Diode Selection
Schottky diode is a good choice for high efficiency
operation because of its low forward voltage drop and
fast reverse recovery. The current rating of the diode
must meet following:
( )I D (RMS ) IOUT × I PEAK
AN_SY7152 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 6

6 Page



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部品番号部品説明メーカ
AN-SY7152

High Efficiency 1MHz 2A Step Up Regulator

Silergy
Silergy


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